/* Grows a file in chunks while subprocesses read the growing
   file. */

#include <random.h>
#include <syscall.h>
#include "tests/filesys/extended/syn-rw.h"
#include "tests/lib.h"
#include "tests/main.h"

char buf[BUF_SIZE];

#define CHILD_CNT 4

void test_main(void)
{
    pid_t children[CHILD_CNT];
    size_t ofs;
    int fd;

    CHECK(create(file_name, 0), "create \"%s\"", file_name);
    CHECK((fd = open(file_name)) > 1, "open \"%s\"", file_name);

    exec_children("child-syn-rw", children, CHILD_CNT);

    random_bytes(buf, sizeof buf);
    quiet = true;
    for (ofs = 0; ofs < BUF_SIZE; ofs += CHUNK_SIZE)
        CHECK(write(fd, buf + ofs, CHUNK_SIZE) > 0,
              "write %d bytes at offset %zu in \"%s\"",
              (int)CHUNK_SIZE, ofs, file_name);
    quiet = false;

    wait_children(children, CHILD_CNT);
}
